DG Kernel Documentation


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ICurve2d_DG Interface

GetParameterRange
GetParameterRange1
SetParameterRange
IsClosed
GetPoint
GetTangent
GetEndPoint
SlideEndPoint
GetNearestPoint
GetLength
GetLengthAt
GetParameterAtLength
GetParameterAtRatio
GetRatioAt
GetIntersection
GetIntersection1

void GetParameterRange(double *min, double *max)


Range_DG GetParameterRange1()


void SetParameterRange(double min, double max)

Modifies parameter range of the curve. The values are expected to be geometrically feasible for the curve


void IsClosed(bool retVal)


DG2D GetPoint(double u)


DG2D GetTangent(double u)


DG2D GetEndPoint(int end)

end is expected to be 0 or 1


bool SlideEndPoint(int end, DG2D point)

Assuming point is geometrically close to the curve, range of the curve is modified so that (projection of) point becomes an end of this curve.


double GetNearestPoint(DG2D point, [out] DG2D pointNearest)

Returns parameter of the nearest point.


double GetLength()


double GetLengthAt(double u)

Returns length of the curve from the first end to the point specified by the parameter u.


double GetParameterAtLength(double length)

Returns parameter of the curve at the point specified by the distance along the curve from the first end to length.


double GetParameterAtRatio(double ratio)

Returns parameter obtained by linear mapping of the parameter range to range [0,1].


double GetRatioAt(double u)

Returns ratio obtained by linear mapping of the parameter range to range [0,1].


int GetIntersection(ICurve2d_DG curve, double tolerance, IArrayDouble_DG paramsThis, IArrayDouble_DG paramsCurve, [out] bool haveTangentialIntersection)

A simplified version of the generic GetIntersection1() method below. Returns an array of non-tangential intersections of the curves. Returns number of intersections, which coinsides with the sizes of both paramsThis and paramsCurve.

The paramsThis and paramsCurve arrays are synchronised: i-th element in each is the parameter value related to i-th intersection point.

haveTangentialIntersection indicates whether the curves have tangential intersection points, where tangents are collinear. If the returned haveTangentialIntersection is true, the GetIntersection1() method below can be used to obtain the full intersection.


bool GetIntersection1(ICurve2d_DG curve, double tolerance, ISetR1_DG paramsThis, ISetR1_DG paramsCurve, IArrayBool_DG flagsTangential)

Intersection of two 2D curves. Returns false if the intersection is empty.

The paramsThis, paramsCurve and flagsTangential are synchronised: i-th range in each, are the parameter values related to i-th intersection.

Isolated intersection points are returned as singleton (min = max) ranges.

flagsTangential[i] is true if the intersection is tangential (tangents are collinear) on the i-th range. flagsTangential can be false only for isolated intersection points.